pydantic/docs/usage_compound.py

from typing import Dict, List, Optional, Union, Set

from pydantic import BaseModel


class Model(BaseModel):
    simple_list: list = None
    list_of_ints: List[int] = None

    simple_dict: dict = None
    dict_str_float: Dict[str, float] = None

    simple_set: set = None
    set_bytes: Set[bytes] = None

    str_or_bytes: Union[str, bytes] = None
    none_or_str: Optional[str] = None

    compound: Dict[Union[str, bytes], List[Set[int]]] = None

print(Model(simple_list=['1', '2', '3']).simple_list)  # > ['1', '2', '3']
print(Model(list_of_ints=['1', '2', '3']).list_of_ints)  # > [1, 2, 3]

print(Model(simple_dict={'a': 1, b'b': 2}).simple_dict)  # > {'a': 1, b'b': 2}
print(Model(dict_str_float={'a': 1, b'b': 2}).dict_str_float)  # > {'a': 1.0, 'b': 2.0}